This research presents a thorough comparison of different modulation techniques employed in dual active bridge (DAB) converters. The performance of a DAB converter is essentially affected by the modulation technique and the operating point, including power level, input, and output voltages. A deep understanding of different modulations is required to achieve the highest performance in the entire operating range. Therefore, this paper focuses on comparing different modulation techniques over a DAB converter's operating span. The comparison results provide guidance to apply the correct modulation in certain working areas keeping the converter on top of its performance. Moreover, the paper proposes an optimization solution with distinct objective functions adoptable in DAB converters to reduce power loss. The proposed optimization approach outperforms the existing solutions regarding generality and simplicity. The optimization associates with the modulation techniques that include more than one degree of freedom, such as extended phase shift (EPS) and dual-phase shift (DPS). The proposed optimization and the investigated modulation techniques are evaluated in terms of the converter's efficiency, current stress, and backflow power. The evaluation is realized by the simulation study of a $10{\rm{\,kW}}$ $800{\rm{V}}/500{\rm{V}}$ SiC-based DAB converter in PLECS software.

中文翻译：

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单相双有源桥式转换器中调制技术的性能评估

本研究对双有源电桥 (DAB) 转换器中采用的不同调制技术进行了全面比较。DAB 转换器的性能主要受调制技术和工作点的影响，包括功率电平、输入和输出电压。要在整个工作范围内实现最高性能，需要深入了解不同的调制。因此，本文侧重于在 DAB 转换器的工作范围内比较不同的调制技术。比较结果为在某些工作区域应用正确调制提供指导，使转换器保持最佳性能。此外，本文提出了一种优化解决方案，该解决方案具有可在 DAB 转换器中采用的不同目标函数以降低功率损耗。所提出的优化方法在通用性和简单性方面优于现有的解决方案。优化与包含多个自由度的调制技术相关，例如扩展相移 (EPS) 和双相移 (DPS)。根据转换器的效率、电流应力和回流功率对所提出的优化和研究的调制技术进行评估。评价是通过模拟研究实现的 电流应力和回流功率。评价是通过模拟研究实现的 电流应力和回流功率。评价是通过模拟研究实现的$10{\rm{\,kW}}$ $800{\rm{V}}/500{\rm{V}}$ PLECS 软件中基于 SiC 的 DAB 转换器。